Bicycle helmet



FIG. 1 is a perspective view of a bicycle helmet showing my new design;

FIG. 2 is a right side view, which is a mirror image of a left side view thereof

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof; and,

FIG. 5 is a top view thereof.

The broken lines in the drawings represent portions of the bicycle helmet that form no part of the claimed design. 

CLAIM The ornamental design for a bicycle helmet, as shown and described. 